Prepared for Air Force Civil Engineer Center, prepared by CH2MHill. Otis ANGB, MA : CH2M Hill, March 2013. The purpose of this Summary Letter Report (SLR) is to document the results of sampling activities conducted at the Chemical Spill-10 (CS-10) plume under the System Performance and Ecological Impact Monitoring (SPEIM) program during the 2012 calendar year. AFCEC 4P08 FA8903-08-D-8769; Task Order 0337. MMR SPEIM/LTM/O&M Program. CDRL #A001j. 437075-SPEIM-SWP-SLR-001. (600) 437075-SPEIM-CS10-SLR-001.